if ! command -v curl > /dev/null || ! command -v git > /dev/null || ! command -v expect > /dev/null || ! command -v rsync > /dev/null || ! command -v unbuffer; then
    if command -v apt-get > /dev/null; then
        ### Debian / Ubuntu
        sudo apt-get update
        sudo apt-get install -y build-essential curl expect git rsync
    elif command -v dnf > /dev/null; then
        ### Fedora
        sudo dnf install -y curl expect git rsync
    elif command -v yum > /dev/null; then
        ### CentOS
        sudo yum install -y curl expect git rsync
    elif command -v pacman > /dev/null; then
        ### Archlinux
        sudo pacman update
        sudo pacman -Syu base-devel curl expect git rsync procps-ng file
    elif command -v zypper > /dev/null; then
        ### OpenSUSE
        sudo zypper install -y curl expect git rsync
    elif command -v apk > /dev/null; then
        ### Alpine
        apk add curl expect git rsync
    elif [ -d /Applications ] && [ -d /Library ]; then
        ### macOS
        sudo xcode-select -p >/dev/null 2>&1 || xcode-select --install
    elif [[ "$OSTYPE" == 'cygwin' ]] || [[ "$OSTYPE" == 'msys' ]] || [[ "$OSTYPE" == 'win32' ]]; then
        ### Windows
        choco install -y curl expect git rsync
    elif command -v nix-env > /dev/null; then
        ### NixOS
        echo "TODO - Add support for NixOS"
    elif [[ "$OSTYPE" == 'freebsd'* ]]; then
        ### FreeBSD
        echo "TODO - Add support for FreeBSD"
    elif command -v pkg > /dev/null; then
        ### Termux
        echo "TODO - Add support for Termux"
    elif command -v xbps-install > /dev/null; then
        ### Void
        echo "TODO - Add support for Void"
    fi
fi